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diff --git a/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-120.js b/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-120.js
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+++ b/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-120.js
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+// Copyright (c) 2012 Ecma International. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.2.3.6-4-120
+description: >
+ Object.defineProperty - 'O' is an Array, 'name' is the length
+ property of 'O', the [[Value]] field of 'desc' is absent, test
+ TypeError is thrown when updating the [[Configurable]] attribute
+ of the length property from false to true (15.4.5.1 step 3.a.i)
+---*/
+
+var arrObj = [];
+assert.throws(TypeError, function() {
+ Object.defineProperty(arrObj, "length", {
+ configurable: true
+ });
+});
+
+reportCompare(0, 0);